John Breed, Diary and Training diary, item 123
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Drawing of different trajectories, labeled A, a, b, c
Now if we take any given distance, say 50 yards, as the
correct distance short, and if in figures we measure up
to 50 yards along the trajectory at a number of different
ranges, to the points a, b, and c we shall find that these
points, as seen from the gun are practically in the same
straight line. If therefore we measure the angle A, and
find it to be say 15 minutes then if we elevate the sighting
telescope or director telescope 15 minutes above the target
any bursts which appear on the cross wires will be the
correct distance from the target.
In fixing the proper distance of the burst, and thence
the angle A for any gun, regard must also be had
to the mean error of the fuze.
This subject involves the Theory of Probabilities and cannot
be adequately dealt with in the present work. But it is
clear that if shrapnel fuzed alike burst at a distance
varying by a [sic] much as 150 yards, a good many of the

Drawing of different trajectories, labeled A, a, b, c
Now if we take any given distance, say 50 yards, as the
correct distance short, and if in figures we measure up
to 50 yards along the trajectory at a number of different
ranges, to the points a, b, and c we shall find that these
points, as seen from the gun are practically in the same
straight line. If therefore we measure the angle A, and
find it to be say 15 minutes then if we elevate the sighting
telescope or director telescope 15 minutes above the target
any bursts which appear on the cross wires will be the
correct distance from the target.
In fixing the proper distance of the burst, and thence
the angle A for any gun, regard must also be had
to the mean error of the fuze.
This subject involves the Theory of Probabilities and cannot
be adequately dealt with in the present work. But it is
clear that if shrapnel fuzed alike burst at a distance
varying by a [sic] much as 150 yards, a good many of the

Drawing of different trajectories, labeled A, a, b, c
Now if we take any given distance, say 50 yards, as the
correct distance short, and if in figures we measure up
to 50 yards along the trajectory at a number of different
ranges, to the points a, b, and c we shall find that these
points, as seen from the gun are practically in the same
straight line. If therefore we measure the angle A, and
find it to be say 15 minutes then if we elevate the sighting
telescope or director telescope 15 minutes above the target
any bursts which appear on the cross wires will be the
correct distance from the target.
In fixing the proper distance of the burst, and thence
the angle A for any gun, regard must also be had
to the mean error of the fuze.
This subject involves the Theory of Probabilities and cannot
be adequately dealt with in the present work. But it is
clear that if shrapnel fuzed alike burst at a distance
varying by a [sic] much as 150 yards, a good many of the
Description
Save descriptionLocation(s)
 ID
 17035 / 198362
 Contributor
 Mrs Jean Hanby
 Western Front
 Artillery
 Trench Life
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